Abstract
WMN (wireless mesh network) is a useful wireless multihop network with tremendous research value. The routing strategy decides the performance of network and the quality of transmission. A good routing algorithm will use the whole bandwidth of network and assure the quality of service of traffic. Since the routing metric ETX (expected transmission count) does not assure good quality of wireless links, to improve the routing performance, an opportunistic routing mechanism combined with long-term and short-term metrics for WMN based on OLSR (optimized link state routing) and ETX is proposed in this paper. This mechanism always chooses the highest throughput links to improve the performance of routing over WMN and then reduces the energy consumption of mesh routers. The simulations and analyses show that the opportunistic routing mechanism is better than the mechanism with the metric of ETX.
Highlights
Wireless mesh network based on IEEE 802.11 is a wireless multihop network which is easy to deploy, is of low cost, and has wide coverage
The contribution of our work includes the following aspects: (i) analyses of the disadvantage of ETX over WMN with different data transmission rates and probe intervals of ETX through experiments of simulation; (ii) we propose an opportunistic routing mechanism combined with long-term and short-term metrics based on OLSR and ETX to overcome the disadvantage and improve the routing performance; (iii) analyses of theory and implementation to prove the advantage of the opportunistic routing mechanism; (iv) simulation results evaluate the performance of the opportunistic routing mechanism, and it performs better than ETX
Since ETX does not reflect the change of BER in time with its long-term routing metric, we propose an opportunistic routing mechanism which combines with longterm and short-term routing metrics to solve the problem of ETX when it is applied in practice
Summary
Wireless mesh network based on IEEE 802.11 is a wireless multihop network which is easy to deploy, is of low cost, and has wide coverage. WMN is an efficient extension of wired network. It overcomes the limitation of the harsh geographical conditions and provides high-speed transmission. The data flow starts from node A to node E, and the ETX of links B → C and B → D are 3 and 5, respectively. According to traditional mechanism with the routing metric of ETX, node B will choose node C as the hop to transmit. We study the problem of original ETX used in WMN. We consider a wireless mesh network deployed in a simple topology which has three source destination pairs of data which start simultaneously. Two important parameters that are related to the problem are data transmission rate and probe interval of ETX.
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